Hachijojima Island — Water Temperature in April

Water Temperature Range

13°C

minimum

17°C

average

21°C

maximum

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Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2026	2025	2024	2023
APR 1	-10°C	21°C	16°C	17°C
APR 2	21°C	16°C	16°C	17°C
APR 3	21°C	17°C	17°C	18°C
APR 4	21°C	17°C	17°C	18°C
APR 5	21°C	16°C	16°C	17°C
APR 6	21°C	16°C	16°C	17°C
APR 7	21°C	17°C	17°C	18°C
APR 8	21°C	17°C	17°C	17°C
APR 9	21°C	17°C	17°C	18°C
APR 10	21°C	17°C	17°C	18°C
APR 11	21°C	16°C	16°C	17°C
APR 12	21°C	16°C	16°C	17°C
APR 13	21°C	16°C	16°C	17°C
APR 14	21°C	16°C	16°C	17°C
APR 15	21°C	16°C	16°C	17°C
APR 16	21°C	16°C	16°C	17°C
APR 17	22°C	17°C	17°C	18°C
APR 18	22°C	17°C	17°C	17°C
APR 19	22°C	16°C	16°C	17°C
APR 20	22°C	17°C	17°C	17°C
APR 21	22°C	16°C	16°C	17°C
APR 22	22°C	17°C	17°C	17°C
APR 23	22°C	17°C	17°C	17°C
APR 24	22°C	17°C	17°C	17°C
APR 25	22°C	17°C	17°C	18°C
APR 26	22°C	17°C	17°C	17°C
APR 27	22°C	17°C	17°C	18°C
APR 28	22°C	17°C	17°C	18°C
APR 29	22°C	17°C	17°C	18°C
APR 30	22°C	18°C	18°C	19°C

April: Climate and Swimming Opportunities

Average Night Air Temperature

9°C

Average Day Air Temperature

19°C

Precipitation Amount per Month

153 mm

Number of Rainy Days

Daylight per Day

13 hrs

Sunshine per Day

6 hrs

Average Wind Speed

12 km/h

Average Humidity

69%

At such water and air temperatures, swimming often feels chilly and is best for short swims. Getting out can feel cold, so it helps to have dry clothes ready right away.